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진경복,이문노,신진호 한국반도체디스플레이기술학회 2012 반도체디스플레이기술학회지 Vol.11 No.3
This paper presents a velocity disturbance estimation system for the stable fine seek control using a genetic algorithm. To estimate accurately the velocity disturbance in spite of the uncertainties of fine actuator, the system utilizes an objective function to minimize the differences of the frequency characteristics between the nominal velocity control loop and the extremal velocity control loops. The objective function is considered by applying a genetic algorithm and the velocity disturbance is estimated by the measurable velocity, the adjusted velocity controller, and the fine actuator model. The proposed velocity disturbance estimation system is applied to the fine seek control system of a DVD recording device and is evaluated through the experimental results.
진경복 한국기술교육대학교 2003 論文集 Vol.10 No.1
Optical axis misalignment, which represents the position deviation of the objective lens from the optical axis, is an inevitable assembling error in an optical pick-up. Since the laser power intensity varies with the distance from the optical axis, the misalignment leads to variation of the laser spot power intensity, which is one of the critical factors increasing data bit-error-rate in optical disc drives. In this paper, an auto-adjustment scheme for optical axis alignment is proposed to eliminate the undesirable variation of the laser spot power intensity in optical disc drives. An envelope of the data signal is extracted and utilized to detect the optical axis misalignment. Then an adjustment input is added to the driving input of the tracking actuator to shift the objective lens to the optical axis. Finally, the feasibility is verified by a series of experiments.
진경복,윤인호,송길호,김상연 한국지식정보기술학회 2017 한국지식정보기술학회 논문지 Vol.12 No.2
Natural user interaction systems are widely used for reducing the learning curve of a user to adapt usage of many applications. For example, a user can enlarge or reduce the size of a virtual object by scrolling with two fingers and can move an object by dragging with his/her finger pads or arms. The objective of this research is to develop a motion UX-based educational system that helps sensory, movement and cognitive capabilities of the developmental disorder children and allows them to adapt to teach direction. The tangible UX-based educational system consists of a motion input device and a motion creating device. The motion input device allows the developmental disorder children to intuitively manipulate the motion creating device. The position and the velocity informations created by motion input device are transferred to the motion creating device, and are converted into the speed and the direction for controlling motors which are inserted into the motion creating device. We have conducted an experiment in order to show that developmental disorder children can learn the direction information (the meaning of left, right, front, and back). The experimental result shows that the proposed system can be suitable for training the developmental disorder children to learn the direction information.
진경복,최동수,임성민,김상연 한국지식정보기술학회 2014 한국지식정보기술학회 논문지 Vol.9 No.3
This paper suggests an immersive mobile racing game which allows a user to haptically and visually sense virtual environment. For constructing the immersive mobile racing game, we develop a mobile platform which expresses the reaction of a car on a road surface and simulates the road surface using tactile information. To simulate the road surface, we first design a tiny tactile module with an elastic spring, a permanent magnet, and a solenoid coil and insert it into the mobile platform. Eccentric vibration motors and an impact actuator are incorporated into the mobile platform to simulate the reaction of a car. A thermal feedback module is developed using thermal feedback unit composed of a heat conduction plate and a temperature sensor and is embedded into the developed mobile platform. An inertia measurement unit (an IMU) is inserted into the mobile platform so that the developed platform measures a user’s motion. The developed mobile platform is used as an interface for providing tactile feedback, vibration, and thermal feedback, all of which are important physical property of virtual environment, to a user. We investigate the temporal resolution of the proposed game system because it is considered as a key factor affecting haptic perception. The experimental result shows that proposed system has the possibility to provide immersive sensation to a user.